A cooling air ring for a film blowing apparatus

Abstract

The utility model is suitable for the technical field of plastic film processing equipment, provides a kind of blown film equipment cooling air ring.The blown film equipment cooling air ring includes air ring main body and shunt air duct group, the shunt air duct group is arranged in the air ring main body;Radial air duct and annular air duct are provided in the air ring main body;The shunt air duct group includes several shunt pieces, several shunt pieces are obliquely arranged and annular array distribution in the air ring main body inner circle, the annular air duct is divided into first annular air duct and second annular air duct, and ventilation opening is arranged between adjacent two shunt pieces;Air inlet is provided on the outer side of the air ring main body, and air outlet is provided in the center;On the radial air duct, airflow passes air inlet, first annular air duct, second annular air duct and air outlet in sequence.When airflow enters second annular air duct from first annular air duct, the uniformity of airflow flow in entire second annular air duct can be improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic film processing equipment, and particularly relates to a cooling air ring for blown film equipment. Background Technology

[0002] In plastic blown film processing, molten material is extruded from an annular die to form a film bubble, which is then rapidly cooled and shaped by the cold airflow of a cooling air ring. The uniformity of cooling directly affects the thickness consistency, mechanical properties, and surface quality of the film. Traditional cooling air rings typically employ a combination structure of an annular main air duct and radial guide channels, with airflow entering from the main air inlet and then being evenly distributed circumferentially to the annular air outlet.

[0003] However, the existing cooling air ring is a single-inlet air ring, which means that the cooling air is blown into the air ring from one side. This will cause the air force in each direction of the main annular air duct of the air ring to be different. Therefore, in actual production, uneven circumferential cooling of the film bubble often occurs, resulting in local film bubble thickness deviation, such as a certain point being too thick or too thin, which in turn affects the quality of the finished film. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a cooling air ring for a blown film equipment, which aims to solve the problem of uneven airflow from the air ring.

[0005] This utility model embodiment is implemented as follows: a cooling air ring for a blown film equipment, the cooling air ring for the blown film equipment includes an air ring body and a diversion air duct group, the diversion air duct group being disposed within the air ring body; The main body of the air ring is equipped with radial air ducts and circumferential air ducts; The diversion duct assembly includes several diversion plates, which are inclined and arranged in a ring array on the inner circumference of the air ring body, dividing the circumferential air duct into a first circumferential air duct and a second circumferential air duct. Ventilation openings are provided between two adjacent diversion plates. An air inlet is provided on the outer side of the main body of the air ring, and an air outlet is provided in the center; on the radial air duct, the airflow passes through the air inlet, the first circumferential air duct, the second circumferential air duct and the air outlet in sequence.

[0006] Furthermore, the air entering the first circumferential air duct is blocked and diverted by the diverter, and then enters the second circumferential air duct.

[0007] Furthermore, the flow divider is an arc-shaped piece that bends toward the center of the wind ring body.

[0008] Furthermore, the diversion duct assembly also includes a diversion base plate and a first ring plate. The first ring plate is provided with a ventilation opening. The first ring plate is vertically arranged inside the diversion duct assembly, and a third ring duct is located at the dividing point inside the second ring duct.

[0009] Furthermore, a second ring plate is provided inside the main body of the air ring, the second ring plate is located inside the first ring plate, a third ring plate is arranged horizontally on the second ring plate, a ventilation opening is provided on the third ring plate, and the second ring plate and the third ring plate are separated into a fourth circumferential air duct inside the third circumferential air duct.

[0010] Furthermore, a fourth ring plate is provided on the inner side of the main body of the air ring. The fourth ring plate is vertically arranged inside the third ring plate. A ventilation opening is provided on the fourth ring plate, and a fifth ring air duct is separated inside the fourth ring air duct.

[0011] Furthermore, the main body of the air ring includes an air ring base and an air ring top cover, the diversion air duct assembly is fitted inside the air ring base, and the air ring top cover covers the diversion air duct assembly.

[0012] This utility model provides a cooling air ring for a blown film equipment. Its advantages lie in the fact that the flow dividers are inclined and distributed in a ring shape. Airflow enters the main body of the air ring from the air inlet and, due to the obstruction of the flow dividers, diffuses in both clockwise and counterclockwise directions: in the counterclockwise direction, the airflow flows counterclockwise along the first circumferential air duct; in the clockwise direction, the airflow enters the second circumferential air duct through the ventilation opening between two adjacent flow dividers, flowing clockwise. When the airflow enters the second circumferential air duct from the first circumferential air duct, the uniformity of the airflow throughout the second circumferential air duct is improved. Attached Figure Description

[0013] Figure 1 A perspective view of the cooling air ring of the blown film equipment provided in an embodiment of this utility model; Figure 2 A perspective view of the cooling air ring of the blown film equipment provided in the embodiment of this utility model (without the top cover of the air ring); Figure 3 A top view of the cooling air ring of the blown film equipment provided in an embodiment of this utility model (without the top cover of the air ring). Figure 4 An exploded view of the cooling air ring of the blown film equipment provided in this embodiment of the utility model; Figure 5 A perspective view of the diversion duct assembly provided for an embodiment of this utility model; Figure 6 A partial cross-sectional view of the cooling air ring of the blown film equipment provided in an embodiment of this utility model; 100. Main body of the air ring; 110. Outer shell of the air ring; 120. Inner core of the air ring; 121. Second ring plate; 122. Third ring plate; 130. Top cover of the air ring; 131. Fourth ring plate; 200. Diverter duct assembly; 210. Diverter plate; 220. Diverter base plate; 230. First ring plate; 1. Air inlet; 2. First circumferential air duct; 3. Second circumferential air duct; 4. Third circumferential air duct; 5. Fourth circumferential air duct; 6. Fifth circumferential air duct; 7. Air outlet. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0015] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but unless otherwise stated, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0016] In one embodiment, such as Figure 1-4 As shown, a cooling air ring for a blown film equipment is proposed. The cooling air ring for the blown film equipment includes an air ring body 100 and a diversion air duct group 200, wherein the diversion air duct group 200 is disposed within the air ring body 100. The main body 100 of the air ring is equipped with radial air ducts and circumferential air ducts; The diversion duct group 200 includes a plurality of diversion plates 210. The plurality of diversion plates 210 are inclined and arranged in a ring array on the inner circumference of the air ring body 100, dividing the circumferential air duct into a first circumferential air duct 2 and a second circumferential air duct 3. Ventilation openings are provided between two adjacent diversion plates 210. An air inlet 1 is provided on the outer side of the air ring body 100, and an air outlet 7 is provided in the center; on the radial air duct, the airflow passes through the air inlet 1, the first circumferential air duct 2, the second circumferential air duct 3 and the air outlet 7 in sequence.

[0017] In this embodiment, as Figure 2 and 3 As shown, the flow dividers 210 are inclined and distributed in a ring. Airflow enters the air ring body 100 from the air inlet 1 and diffuses in both clockwise and counterclockwise directions due to the obstruction of the flow dividers 210. In the counterclockwise direction, the airflow flows counterclockwise along the first circumferential air duct 2; in the clockwise direction, the airflow enters the second circumferential air duct 3 through the ventilation opening between two adjacent flow dividers 210, flowing clockwise. When the airflow enters the second circumferential air duct 3 from the first circumferential air duct 2, the uniformity of the airflow flow in the entire second circumferential air duct 3 is improved. Previous air rings did not have the flow divider group 200 of this embodiment. The airflow velocity was higher on the side closer to the air inlet 1 and lower on the side farther from the air inlet 1, resulting in uneven film thickness. Therefore, the flow divider group 200 of this embodiment aims to improve the quality of blown film forming.

[0018] In this embodiment, the direction in which the flow divider 210 is set can be either Figure 3 The clockwise tilt shown can also be counterclockwise; this embodiment only uses clockwise as an example. The vents between adjacent diverter plates 210 must not face the radial direction of the air ring body 100. The air entering the first circumferential air duct 2 must be blocked and guided by the diverter plates 210 before entering the second circumferential air duct 3. In this embodiment, to improve the guiding effect, the diverter plate 210 is an arc-shaped plate, curved towards the center of the air ring body 100.

[0019] In this embodiment, as Figure 4 As shown, the main body 100 of the air ring includes an outer shell 110, an inner core 120, and a top cover 130. The diversion duct assembly 200 is fitted around the outer side of the inner core 120. The outer shell 110 is disposed on the outer side of the diversion duct assembly 200, and the top cover 130 covers the outer shell 110 and is located above the diversion duct assembly 200. In this embodiment, the main body 100 of the air ring consists of three parts: the outer shell 110, the inner core 120, and the top cover 130. The outer shell 110, the inner core 120, and the diversion duct assembly 200 can be detachably connected or fixedly connected; the top cover 130 covers the top. In some structures, the inner core 120 is provided with a structure for adjusting the diameter of the duct. The detachable top cover 130 facilitates the adjustment of the airflow at the outlet 7 and the cleaning and maintenance work. The split duct assembly 200 can be set as an independent part, which is convenient for disassembly and installation.

[0020] In this embodiment, as Figure 5 and 6As shown, the diversion duct assembly 200 is provided with a first ring plate 230, which separates the third circumferential duct 4; the inner core 120 and top cover 130 of the air ring body 100 are provided with a second ring plate 121, a third ring plate 122 and a fourth ring plate 131, which separate the third circumferential duct 4, the fourth circumferential duct 5 and the fifth circumferential duct 6. Specifically, the diversion duct assembly 200 also includes a diversion base plate 220 and a first ring plate 230. The first ring plate 230 is provided with a ventilation opening and is vertically arranged inside the diversion duct assembly 200, separating the third circumferential duct 4 inside the second circumferential duct 3. A second ring plate 121 is disposed within the inner core 120 of the air ring, located inside the first ring plate 230. A third ring plate 122 is horizontally disposed on the second ring plate 121, and a ventilation opening is disposed on the third ring plate 122. The second ring plate 121 and the third ring plate 122 separate a fourth circumferential air duct 5 inside the third circumferential air duct 4. A fourth ring plate 131 is also disposed inside the top cover 130 of the air ring, vertically disposed inside the third ring plate 122, and a ventilation opening is disposed on the fourth ring plate 131. A fifth circumferential air duct 6 is separated inside the fourth circumferential air duct 5.

[0021] like Figure 6 As shown, in the radial air duct, the airflow passes through the first annular air duct 2 and enters the second annular air duct 3, and then successively enters the third annular air duct 4, the fourth annular air duct 5 and the fifth annular air duct 6. During this process, the airflow bends as it moves forward, which helps to reduce the airflow velocity and further improves the uniformity of the airflow through multiple annular air ducts.

[0022] Working principle: The airflow enters the first annular air duct 2 from the air inlet 1. It is split into two airflows, clockwise and counterclockwise, by the splitter plate 210. One airflow flows around the first annular air duct 2, and the other airflow enters the second annular air duct 3 through the ventilation opening between two adjacent splitter plates 210. In the radial air duct, the airflow enters the first annular air duct 2, the second annular air duct 3, the third annular air duct 4, the fourth annular air duct 5 and the fifth annular air duct 6 in sequence, and then bends and moves forward in sequence before finally being blown out from the air outlet 7.

[0023] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0024] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling air ring for a blown film equipment, characterized in that, The blowing film equipment cooling air ring includes an air ring body and a diversion air duct assembly, wherein the diversion air duct assembly is disposed within the air ring body; The main body of the air ring is equipped with radial air ducts and circumferential air ducts; The diversion duct assembly includes several diversion plates, which are inclined and arranged in a ring array on the inner circumference of the air ring body, dividing the circumferential air duct into a first circumferential air duct and a second circumferential air duct. Ventilation openings are provided between two adjacent diversion plates. An air inlet is provided on the outer side of the main body of the air ring, and an air outlet is provided in the center; on the radial air duct, the airflow passes through the air inlet, the first circumferential air duct, the second circumferential air duct and the air outlet in sequence.

2. The cooling air ring of the blown film equipment according to claim 1, characterized in that, The air entering the first circumferential air duct is blocked and diverted by the diverter, and then enters the second circumferential air duct.

3. The cooling air ring of the blown film equipment according to claim 2, characterized in that, The flow divider is an arc-shaped piece that bends toward the center of the main body of the air ring.

4. The cooling air ring of the blown film equipment according to claim 1, characterized in that, The diversion duct assembly also includes a diversion base plate and a first ring plate. The first ring plate is provided with a ventilation opening. The first ring plate is vertically arranged inside the diversion duct assembly. A third ring duct is located at the dividing point inside the second ring duct.

5. The cooling air ring of the blown film equipment according to claim 4, characterized in that, The main body of the air ring is provided with a second ring plate, which is located inside the first ring plate. A third ring plate is arranged horizontally on the second ring plate, and a ventilation opening is provided on the third ring plate. The second ring plate and the third ring plate are separated into a fourth circumferential air duct inside the third circumferential air duct.

6. The cooling air ring of the blown film equipment according to claim 5, characterized in that, A fourth ring plate is also provided on the inner side of the main body of the air ring. The fourth ring plate is vertically arranged inside the third ring plate. A ventilation opening is provided on the fourth ring plate, and a fifth ring air duct is separated inside the fourth ring air duct.

7. The cooling air ring of the blown film equipment according to claim 1, characterized in that, The main body of the air ring includes an air ring outer shell, an air ring inner core, and an air ring top cover. The diversion air duct assembly is sleeved on the outside of the air ring inner core. The air ring outer shell is provided on the outside of the diversion air duct assembly. The air ring top cover covers the air ring outer shell and is located above the diversion air duct assembly.

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